Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 7, NWS Grand Forks, ND

May 5, 2012Grant County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at May 5, 2012, 10:01 PM CDT for Grant County, Minnesota. It was in force for 22 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 5, 2012, 10:01 PM CDT (03:01 UTC)
Expired: May 5, 2012, 10:23 PM CDT
In force: 22 min
Issued by: NWS Grand Forks, ND
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Grant County, MN

The radar

The Aberdeen radar (KABR), 203 km from the middle of the area, began a volume at 03:05 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
May 5, 10:14 PM CDT	HAIL 1	Hoffman, MN	STORM LEFT BANKS OF MAINLY DIME TO NICKEL SIZED HAIL COVERING THE GROUND...WITH SOME QUARTER SIZED PIECES IN THE MIX. HEAVY RAINS AND MODERATE TO STRONG WINDS ACCOMPANIED THE HAIL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.0 hours before the alert went out and 211 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 850 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

396 
WUUS53 KFGF 060301
SVRFGF
MNC051-060345-
/O.NEW.KFGF.SV.W.0007.120506T0301Z-120506T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1001 PM CDT SAT MAY 5 2012

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN GRANT COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 1045 PM CDT

* AT 957 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS LOCATED OVER
  DONNELLY...OR 41 MILES SOUTH OF FERGUS FALLS...MOVING TO THE
  NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HOFFMAN AROUND 1015 PM CDT.
  ELBOW LAKE AND BARRETT AROUND 1020 PM CDT.
  ERDAHL AROUND 1030 PM CDT.
  ASHBY AROUND 1035 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF SEVERE WEATHER IS OBSERVED CONTACT YOUR LOCAL LAW ENFORCEMENT AND
ASK THEM TO RELAY YOUR INFORMATION TO THE NATIONAL WEATHER SERVICE IN
GRAND FORKS.

&&

LAT...LON 4576 9605 4610 9594 4610 9577 4593 9575
      4576 9575 4575 9577
TIME...MOT...LOC 0300Z 212DEG 38KT 4572 9598
WIND...HAIL 60MPH 1.00IN

$$
JR

1 follow-up statement

872 
WWUS53 KFGF 060323
SVSFGF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1023 PM CDT SAT MAY 5 2012

MNC051-060332-
/O.CAN.KFGF.SV.W.0007.000000T0000Z-120506T0345Z/
GRANT MN-
1023 PM CDT SAT MAY 5 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN GRANT COUNTY IN WEST
CENTRAL MINNESOTA IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.  HOWEVER SMALL HAIL AND HEAVY RAIN ARE STILL
POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4576 9605 4610 9594 4610 9577 4593 9575
      4576 9575 4575 9577
TIME...MOT...LOC 0322Z 228DEG 38KT 4587 9571

$$

JR

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 5, 9:24 PM CDT	Flash Flood Watch	FGF	Grant, Otter Tail, Wilkin	2 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.